Basic wood joints explained: butt, pocket hole, dowel, mortise and tenon, dovetail

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A joint is simply how two pieces of wood are held together, and choosing the right one is about balancing strength, appearance, effort and the tools you own. Here are the five joints most beginners meet, from easiest to hardest.

Why glue alone is not always enough

Wood glue bonds very strongly to long grain (the sides of a board). It bonds poorly to end grain, which soaks up glue like a bundle of straws. That is why so many joints exist: they create more long-grain gluing surface, or add a mechanical lock, or both.

1. Butt joint

One piece simply meets another, end to face, and is held with glue plus screws or nails.

Difficulty: the easiest.
Strength: the weakest, because the glue is mostly on end grain. Screws or nails do the real work.
Use it for: boxes, rough shelving, utility projects, frames that are not stressed.
Tips: drill pilot holes so screws do not split the wood, and countersink so the heads sit flush.

2. Pocket-hole joint

A screw is driven at a steep angle through one piece into the other, using a drilling jig that cuts the angled pocket.

Difficulty: easy once you have the jig.
Strength: good for many furniture frames and face frames; stronger than a plain butt joint.
Use it for: cabinet face frames, table aprons, quick furniture builds.
Downsides: the holes are visible unless hidden on the inside or plugged, and you need the jig and matching screws.

3. Dowel joint

Round wooden pins fit into matching holes in both pieces and are glued in.

Difficulty: easy to moderate. The challenge is getting the holes to line up exactly; a doweling jig or dowel centres help a lot.
Strength: good, with more long-grain glue surface than a butt joint and no visible fixings.
Use it for: edge-joining boards, simple frames, furniture where you want a clean look.
Tips: use fluted dowels so excess glue can escape, and do not drill deeper than you need.

4. Mortise and tenon

A tongue (the tenon) on one piece fits snugly into a slot (the mortise) cut in the other. It has been used for centuries in furniture and timber framing.

Difficulty: moderate. It can be cut with a saw and chisels, a drill to waste the mortise, or machines.
Strength: very strong, with lots of long-grain glue surface and resistance to racking.
Use it for: chairs, tables, doors and any frame that takes load.
Tips: cut the mortise first, then fit the tenon to it. Aim for a snug fit you can push together by hand; too tight can split the wood, too loose relies on glue to fill gaps.

5. Dovetail

Fan-shaped tails on one board interlock with pins on the other, so the joint cannot be pulled apart in one direction even without glue.

Difficulty: the hardest of the five by hand, and the one many woodworkers see as a test of skill. Jigs for routers make them easier.
Strength: very strong against pulling forces, and attractive.
Use it for: drawers, boxes, chests and carcass corners.
Tips: practise on cheap softwood first. Accurate marking with a knife and sawing exactly to the line matter more than anything.

Choosing a joint

Quick, hidden, functional: butt joints with screws, or pocket holes.
Clean look without special skill: dowels.
Furniture that must take load for years: mortise and tenon.
Drawers and fine boxes: dovetails, once you have practised.

Good practice for any joint

Mark from one reference face and edge so errors do not add up.
Dry-fit before glue goes on.
Use enough glue for a thin bead of squeeze-out, and clean it off before it dries if you plan to stain.
Clamp evenly and check for square by measuring the diagonals.
Leave the glue to cure for the time given on the bottle before stressing the joint.

Which joint are you trying for the first time, or which one gave you the most trouble? Tell us in the comments.